Method of grinding viscous materials



May 10, 1927. H F. WINSLOW/ 1,628,211

METHOD OF GRINDING VISCOUS MATERIALS Filed June 29, 1921 Patented May 10, 19 27. I

uru'rau STATES PATENT OFFICE.

HARRY I. WINSLQW, OF BROOKLYN, NEW YORK.

xn'rnon or GRINDING viscous Mara-nu ls.

Application filed June 29, 1921. serial No. 481,324.

ensure of a complete and thorough grinding "above the meeting line of the rolls2 and of the material before it passes from the grinding elements to the receivlng device.

In grinding materials of this type it is' customary to employ a series of grinding rolls over which the material is carried, being drawn from one roller to t-he next succeeding one. In the methods of grinding as ordinarily carried out,v the coarser particles of material tend to work gradually outward toward the ends of the rolls resulting in an incomplete grinding of the material and the discharge of the coarser particles at the ends of the rolls.

In carrying out the grinding according to the present method an automatic regrinding of the coarser particles is effected, the relatively coarse material adjacent the ends of the rolls being thrown back from a later to an earlier roll of the sequence and thus )revented from being delivered with the ner material.

In the accompanying drawings I have illustrated diagrammatically an apparatus arranged to grind material according to the present invention.

Fig. 1 of the drawings is a side view of the apparatus, showing the rollers in end.

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Fig. 2 is a side view of one of the rolls, showing the arrangement of the scrapers.

In the drawings I have indicated a sequence of three rolls, 1, 2 and 3. These rolls are suitably supported and are driven in the usual manner at successively increas ing speed by any suitable means. The material to be ound is piled upon the converging portions of the rolls 1 and2 as indicated at 5. The ground material may be taken from the last roll 3 by a scraper 6 and delivered to a suitable receptacle.

In order to efiect the regrinding of the ma- .terial a pair of scraper plates 8 are located toward opposite ends thereof. These scraper plates are positioned with the I bottom or scraping edges thereof a short distance above the meeting line of the rolls which are moving upwardly at their ad'acent sides toward the scrapers, as indicated y the large arrows. The scrapers 8 are preferably pressed against the roll 3 by the spring 9.-

The coarser particles of material which have worked toward the ends of the rolls by the time they reach roll 3 are prevented from traveling around the latter to the delivery scraper 6 by the scraper plates 8, which re-: move the material from the end portions of roll 3 and refeed it on the top or backwardly traveling surface of roll 2, as indicated by the small arrows, causing it to pass again through the sequence of rolls.

Having thus described my invention what I claim as new and desire to secure by Letters Patent of the United States is as follows:

1. The method-of grinding viscous material which consists in passing the same over a sequence of grinding rolls, delivering as a finished product a limited amount of the material from a later roll of the sequence interminate the ends thereof, and causing the remainder of the material adjacent the ends of said later roll to be depositedon an earlier roll of the sequence.

2. The method of grinding viscous materials which consists in passing the same over a sequence of grinding rolls, causing the materialadjacent the ends of a later roll in the sequence to be deposited on an earlier roll, and delivering as a finished product the remainder of the material on said later roll.

3. The method of grinding viscous materials which consists in passing the same in engagement with a sequence of grinding members, removing certain portions of the material as it is being carried forward by a later member of the sequence and causing it to be deposited on an earlier member of the sequence, and delivering as a finished product the remainder of the material on said later member.

4. The method of grinding viscous materials which consists of passing the same over a sequence of grinding rolls and automatically removing the material adjacent the ends only of a later roll of the sequence from said roll and depositing it on an earlier roll of the sequence.

5. The method of grinding viscous macentthe ends of said later roll to be deposited terial which consists in passing the same over on an earlier roll of the sequence. a sequence of grinding rolls, delivering as a Signed at Brooklyn, in the county of W finished product a limited amount of the ma- Kings and State of New York, this 28th day 5 terial from a later roll of the sequence interof June A. D. 1921.

mediate the ends thereof, and automatically causing the remainder of the material adja- HARRY F. WINSLOW. 

